page{
  color: #999;
  font-family:PingFangSC-Medium,PingFang SC;

}
.center{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.center-x{
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.center-y{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}
.pos-r{
  position: relative;
}
.max-wh{
  max-width: 100%;
  max-height: 100%;
}
.maxwh{
  width: 100%;
  height: 100%;
}
.fl{
  float: left;
}
.fr{
  float: right;
}
.clear{
  clear: both;
}
.clearfix::after{
  content: ' ';
  width: 0;
  height: 0;
  clear: both;
}